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在安卓系统中如何以编程方式获取屏幕密度？

androiddpiscreen-density
560

如何在Android中以编程方式获取屏幕密度？

我的意思是：如何查找当前设备的屏幕dpi？

10
很多答案提到了getDisplayMetrics().xdpi，它应该返回设备的实际 dpi 值。请注意，由于制造商没有一致正确地设置这个值，因此您不能仅仅依赖它们。可悲而真实的是：关于实际 dpi 的信息不可用。来源：https://groups.google.com/d/msg/android-developers/g56jV0Hora0/9d8p8QJg1ksJ - sulai
2
getResources().getDisplayMetrics().xdpi 和 getResources().getDisplayMetrics().ydpi 将会给你实际的水平和垂直密度，在大多数情况下是不同的。 - Ωmega
21个回答
13
public static String getDensity(Context context) {
    String r;
    DisplayMetrics metrics = new DisplayMetrics();

    if (!(context instanceof Activity)) {
        r = "hdpi";
    } else {
        Activity activity = (Activity) context;
        activity.getWindowManager().getDefaultDisplay().getMetrics(metrics);

        if (metrics.densityDpi <= DisplayMetrics.DENSITY_LOW) {
            r = "ldpi";
        } else if (metrics.densityDpi <= DisplayMetrics.DENSITY_MEDIUM) {
            r = "mdpi";
        } else {
            r = "hdpi";
        }
    }

    return r;
}
11

如果你想从一个服务中获取密度，可以按照以下方式进行：

WindowManager wm = (WindowManager) this.getSystemService(Context.WINDOW_SERVICE);
DisplayMetrics metrics = new DisplayMetrics();
wm.getDefaultDisplay().getMetrics(metrics);
当我没有windowManager时，这个帮了我。 - silentsudo
8

你应该尝试这个。刚刚添加了一种方法，可以找到并显示Toast消息。以此确定设备所属的类别。

public static int differentDensityAndScreenSize(Context context) {
  int value = 20;
  String str = "";
  if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_SMALL) {
   switch (context.getResources().getDisplayMetrics().densityDpi) {
   case DisplayMetrics.DENSITY_LOW:
    str = "small-ldpi";
    value = 20;
    break;
   case DisplayMetrics.DENSITY_MEDIUM:
    str = "small-mdpi";
    value = 20;
    break;
   case DisplayMetrics.DENSITY_HIGH:
    str = "small-hdpi";
    value = 20;
    break;
   case DisplayMetrics.DENSITY_XHIGH:
    str = "small-xhdpi";
    value = 20;
    break;
   case DisplayMetrics.DENSITY_XXHIGH:
    str = "small-xxhdpi";
    value = 20;
    break;
   case DisplayMetrics.DENSITY_XXXHIGH:
    str = "small-xxxhdpi";
    value = 20;
    break;
   case DisplayMetrics.DENSITY_TV:
    str = "small-tvdpi";
    value = 20;
    break;
   default:
    str = "small-unknown";
    value = 20;
    break;
   }

  } else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_NORMAL) {
   switch (context.getResources().getDisplayMetrics().densityDpi) {
   case DisplayMetrics.DENSITY_LOW:
    str = "normal-ldpi";
    value = 82;
    break;
   case DisplayMetrics.DENSITY_MEDIUM:
    str = "normal-mdpi";
    value = 82;
    break;
   case DisplayMetrics.DENSITY_HIGH:
    str = "normal-hdpi";
    value = 82;
    break;
   case DisplayMetrics.DENSITY_XHIGH:
    str = "normal-xhdpi";
    value = 90;
    break;
   case DisplayMetrics.DENSITY_XXHIGH:
    str = "normal-xxhdpi";
    value = 96;
    break;
   case DisplayMetrics.DENSITY_XXXHIGH:
    str = "normal-xxxhdpi";
    value = 96;
    break;
   case DisplayMetrics.DENSITY_TV:
    str = "normal-tvdpi";
    value = 96;
    break;
   default:
    str = "normal-unknown";
    value = 82;
    break;
   }
  } else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_LARGE) {
   switch (context.getResources().getDisplayMetrics().densityDpi) {
   case DisplayMetrics.DENSITY_LOW:
    str = "large-ldpi";
    value = 78;
    break;
   case DisplayMetrics.DENSITY_MEDIUM:
    str = "large-mdpi";
    value = 78;
    break;
   case DisplayMetrics.DENSITY_HIGH:
    str = "large-hdpi";
    value = 78;
    break;
   case DisplayMetrics.DENSITY_XHIGH:
    str = "large-xhdpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_XXHIGH:
    str = "large-xxhdpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_XXXHIGH:
    str = "large-xxxhdpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_TV:
    str = "large-tvdpi";
    value = 125;
    break;
   default:
    str = "large-unknown";
    value = 78;
    break;
   }

  } else if ((context.getResources().getConfiguration().screenLayout & Configuration.SCREENLAYOUT_SIZE_MASK) == Configuration.SCREENLAYOUT_SIZE_XLARGE) {
   switch (context.getResources().getDisplayMetrics().densityDpi) {
   case DisplayMetrics.DENSITY_LOW:
    str = "xlarge-ldpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_MEDIUM:
    str = "xlarge-mdpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_HIGH:
    str = "xlarge-hdpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_XHIGH:
    str = "xlarge-xhdpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_XXHIGH:
    str = "xlarge-xxhdpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_XXXHIGH:
    str = "xlarge-xxxhdpi";
    value = 125;
    break;
   case DisplayMetrics.DENSITY_TV:
    str = "xlarge-tvdpi";
    value = 125;
    break;
   default:
    str = "xlarge-unknown";
    value = 125;
    break;
   }
  }
// The Toast will show the Device falls in Which Categories.
Toast.makeText(MainActivity.this, ""+str, Toast.LENGTH_SHORT).show();

  return value;
 }

http://www.androidwarriors.com/2016/01/how-to-find-different-devices-screen.html

7

另一个答案：

/**
* @return "ldpi", "mdpi", "hdpi", "xhdpi", "xhdpi", "xxhdpi", "xxxhdpi", "tvdpi", or "unknown".
*/
public static String getDensityBucket(Resources resources) {
    switch (resources.getDisplayMetrics().densityDpi) {
        case DisplayMetrics.DENSITY_LOW:
            return "ldpi";
        case DisplayMetrics.DENSITY_MEDIUM:
            return "mdpi";
        case DisplayMetrics.DENSITY_HIGH:
            return "hdpi";
        case DisplayMetrics.DENSITY_XHIGH:
            return "xhdpi";
        case DisplayMetrics.DENSITY_XXHIGH:
            return "xxhdpi";
        case DisplayMetrics.DENSITY_XXXHIGH:
            return "xxxhdpi";
        case DisplayMetrics.DENSITY_TV:
            return "tvdpi";
        default:
            return "unknown";
    }
}
7

这应该可以正常工作。

DisplayMetrics dm = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(dm);
int width = dm.widthPixels; //320
int height = dm.heightPixels; //480
4
显示屏的像素大小并不等同于其像素密度。 - joshperry
1
这是密度无关像素而不是像素。你看到的320是320dip而不是320px。像素的计算方式不同，请参考此链接https://dev59.com/vlnUa4cB1Zd3GeqPcaW5#6841335。 - Lukap
4
尝试这样做...
使用Kotlin语言实现
fun determineScreenDensityCode(): String {
      return when (resources.displayMetrics.densityDpi) {
         DisplayMetrics.DENSITY_LOW -> "ldpi"
         DisplayMetrics.DENSITY_MEDIUM -> "mdpi"
         DisplayMetrics.DENSITY_HIGH -> "hdpi"
         DisplayMetrics.DENSITY_XHIGH, DisplayMetrics.DENSITY_280 -> "xhdpi"
         DisplayMetrics.DENSITY_XXHIGH, DisplayMetrics.DENSITY_360, DisplayMetrics.DENSITY_400, DisplayMetrics.DENSITY_420 -> "xxhdpi"
         DisplayMetrics.DENSITY_XXXHIGH, DisplayMetrics.DENSITY_560 -> "xxxhdpi"
         else -> "Unknown code ${resources.displayMetrics.densityDpi}"
     }
}

您可以通过 println("density: ${determineScreenDensityCode()}") 进行调用， 输出结果将为 System.out: density: xxxhdpi

。 这段代码与屏幕密度相关。

4

获取设备加载的像素密度的另一种方法：

为每个像素密度创建values文件夹

  • values（默认mdpi）
  • values-hdpi
  • values-xhdpi
  • values-xxhdpi
  • values-xxxhdpi

在它们各自的strings.xml中添加一个字符串资源：

<string name="screen_density">MDPI</string>    <!-- ..\res\values\strings.xml -->
<string name="screen_density">HDPI</string>    <!-- ..\res\values-hdpi\strings.xml -->
<string name="screen_density">XHDPI</string>   <!-- ..\res\values-xhdpi\strings.xml -->
<string name="screen_density">XXHDPI</string>  <!-- ..\res\values-xxhdpi\strings.xml -->
<string name="screen_density">XXXHDPI</string> <!-- ..\res\values-xxxhdpi\strings.xml -->

然后只需获取字符串资源，就可以获得您的密度：

String screenDensity = getResources().getString(R.string.screen_density);

如果密度大于XXXHDPI，则默认为XXXHDPI，如果密度低于HDPI，则默认为MDPI。

R.strings.screen_density values

我省略了LDPI，因为在我的使用情况下它并不必要。

我认为这是获取密度的正确方法。因为我使用了getResources(). getDisplayMetrics() .density，如果我在设置中更改了显示大小，密度就会改变。 - Fantasy Fang
2

Kotlin

LocalContext.current.resources.displayMetrics.density

获取密度倍数。

1
在Android中，您可以通过以下方式获取屏幕密度：
public static String getScreenDensity(Context context)
{
    String density;
    switch (context.getResources().getDisplayMetrics().densityDpi)
    {
        case DisplayMetrics.DENSITY_LOW:
            density = "LDPI";
            break;
        case DisplayMetrics.DENSITY_140:
            density = "LDPI - MDPI";
            break;
        case DisplayMetrics.DENSITY_MEDIUM:
            density = "MDPI";
            break;
        case DisplayMetrics.DENSITY_180:
        case DisplayMetrics.DENSITY_200:
        case DisplayMetrics.DENSITY_220:
            density = "MDPI - HDPI";
            break;
        case DisplayMetrics.DENSITY_HIGH:
            density = "HDPI";
            break;
        case DisplayMetrics.DENSITY_260:
        case DisplayMetrics.DENSITY_280:
        case DisplayMetrics.DENSITY_300:
            density = "HDPI - XHDPI";
            break;
        case DisplayMetrics.DENSITY_XHIGH:
            density = "XHDPI";
            break;
        case DisplayMetrics.DENSITY_340:
        case DisplayMetrics.DENSITY_360:
        case DisplayMetrics.DENSITY_400:
        case DisplayMetrics.DENSITY_420:
        case DisplayMetrics.DENSITY_440:
            density = "XHDPI - XXHDPI";
            break;
        case DisplayMetrics.DENSITY_XXHIGH:
            density = "XXHDPI";
            break;
        case DisplayMetrics.DENSITY_560:
        case DisplayMetrics.DENSITY_600:
            density = "XXHDPI - XXXHDPI";
            break;
        case DisplayMetrics.DENSITY_XXXHIGH:
            density = "XXXHDPI";
            break;
        case DisplayMetrics.DENSITY_TV:
            density = "TVDPI";
            break;
        default:
            density = "UNKNOWN";
            break;
    }

    return density;
}

而在 Kotlin 中就像这样：

fun getScreenDensity(context: Context): String {
    val density: String
    when (context.resources.displayMetrics.densityDpi) {
        DisplayMetrics.DENSITY_LOW -> density = "LDPI"
        DisplayMetrics.DENSITY_140 -> density = "LDPI - MDPI"
        DisplayMetrics.DENSITY_MEDIUM -> density = "MDPI"
        DisplayMetrics.DENSITY_180, DisplayMetrics.DENSITY_200, DisplayMetrics.DENSITY_220 -> density = "MDPI - HDPI"
        DisplayMetrics.DENSITY_HIGH -> density = "HDPI"
        DisplayMetrics.DENSITY_260, DisplayMetrics.DENSITY_280, DisplayMetrics.DENSITY_300 -> density = "HDPI - XHDPI"
        DisplayMetrics.DENSITY_XHIGH -> density = "XHDPI"
        DisplayMetrics.DENSITY_340, DisplayMetrics.DENSITY_360, DisplayMetrics.DENSITY_400, DisplayMetrics.DENSITY_420, DisplayMetrics.DENSITY_440 -> density =
            "XHDPI - XXHDPI"
        DisplayMetrics.DENSITY_XXHIGH -> density = "XXHDPI"
        DisplayMetrics.DENSITY_560, DisplayMetrics.DENSITY_600 -> density = "XXHDPI - XXXHDPI"
        DisplayMetrics.DENSITY_XXXHIGH -> density = "XXXHDPI"
        DisplayMetrics.DENSITY_TV -> density = "TVDPI"
        else -> density = "UNKNOWN"
    }

    return density
}

请确保定期检查是否添加了新的密度。

1

对于Jetpack Compose，首先在可组合函数中获取屏幕密度：

var density = LocalDensity.current.density

然后像其他答案一样关闭密度值

    if (density >= 4.0) {
        return "xxxhdpi";
    }
    if (density >= 3.0) {
        return "xxhdpi";
    }
    if (density >= 2.0) {
        return "xhdpi";
    }
    if (density >= 1.5) {
        return "hdpi";
    }
    if (density >= 1.0) {
        return "mdpi";
    }
    return "ldpi";
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